Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 17 - Sections 17.1-17.9 - Exercises - Problems by Topic - Page 853: 38a

Answer

$\Delta S_{univ}=162\,J/K$, the reaction is spontaneous.

Work Step by Step

For a spontaneous process, $\Delta S_{univ}$ is positive. $\Delta S_{univ}=\Delta S_{sys}+\Delta S_{surr}$ $\Delta S_{surr}=\frac{-\Delta H_{sys}}{T}=\frac{-(-95\,kJ)}{298\,K}=\frac{95\times10^{3}\,J}{298\,K}=319\,J/K$ $\Delta S_{sys}=-157\,J/K$ Therefore, $\Delta S_{univ}=(-157\,J/K)+(319\,J/K)=162\,J/K$ As $\Delta S_{univ}$ is positive, the reaction is spontaneous.
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